A = 1/2 (b+c)h
rearrange the formula to highlight the heigh
A=12(b+c)hA=\frac{1} {2} (b+c) hA=21(b+c)h
Multiply both sides by 2 to do away with a half;
2×A=(b+c)h2×A=(b+c)h2×A=(b+c)h
Divide both sides by (b+c)(b+c)(b+c) so as to remain with the height ;
h(b+c)(b+c)=2A(b+c)h\frac{(b+c) }{(b+c)} =\frac{2A} {(b+c)}h(b+c)(b+c)=(b+c)2A
The (b+c)(b+c)(b+c) on the numerator and denominator will cancel out making the remainder to be ;
h=2A(b+c)h=\frac{2A}{(b+c)}h=(b+c)2A
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